refactor(infra): directory structure (#4615)

packages/backend/server/src/app.ts

@@ -0,0 +1,26 @@
+import { Module } from '@nestjs/common';
+
+import { AppController } from './app.controller';
+import { ConfigModule } from './config';
+import { MetricsModule } from './metrics';
+import { BusinessModules } from './modules';
+import { AuthModule } from './modules/auth';
+import { PrismaModule } from './prisma';
+import { SessionModule } from './session';
+import { StorageModule } from './storage';
+import { RateLimiterModule } from './throttler';
+
+@Module({
+  imports: [
+    PrismaModule,
+    ConfigModule.forRoot(),
+    StorageModule.forRoot(),
+    MetricsModule,
+    SessionModule,
+    RateLimiterModule,
+    AuthModule,
+    ...BusinessModules,
+  ],
+  controllers: [AppController],
+})
+export class AppModule {}